The paper studies the effects of aqueous extracts of different allelopathic wheat roots on the protective enzymes and osmotic adjustments of cucumber ( Cucumis sativus L. ) seedlings, aiming at clarifying how the aqueous extracts of different allelopathic wheat roots to affect the physiological and biochemical mechanism of cucumber growth and development. Results showed that extracts of stimulative wheat root could increase the activities of SOD, POD, CAT, AsA-POD and the contents of Pro and soluble protein of the cucumber leaves in different periods, which means extracts of stimulative wheat root could increase the resistance of cucumber. The suppressive wheat root extracts could decrease the activities of SOD, AsA-POD and the contents of Pro and soluble protein of cucumber leaves in different periods after treatment. The activities of POD and CAT were increased at 18 days after treatment.%研究了不同化感效应小麦品种（化感促进和化感抑制品种）根系分泌物对黄瓜幼苗叶片保护酶活性及渗透调节物质的影响,旨在明确不同化感效应的小麦品种对黄瓜生长发育影响的生理生化机制.结果表明,具有化感促进作用的小麦根系分泌物在处理后的不同时期可以显著提高黄瓜幼苗叶片的超氧化物歧化酶( SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(AsA-POD)活性,以及脯氨酸、可溶性蛋白含量,从而增加植株抗性；而具有化感抑制作用的小麦根系分泌物在处理后的不同时期能够显著降低黄瓜幼苗叶片保护酶( SOD、AsA-POD)活性及渗透调节物质含量,POD及CAT活性在处理后18d显著提高.
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